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Former world No 1 Karolina Pliskova saved four match points to avoid a shock early exit with a comeback 5-7 7-6 (7-5) 6-3 win against Dayana Yastremska.

Caroline Wozniacki retired due to a back injury after losing the opening three games of her match against Alize Cornet, but there was no surprise defeat for Naomi Osaka as the world No 1 beat Dominika Cibulkova 6-2 7-6 (8-6).